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Thread Details - HUAWEI Community
Unfortunately, the Huawei P30 Pro is not currently supported by Square. We are a great number of Android devices on the market and we strive to support them all, however, a device can meet all the requirements for compatibility but still not communicate properly with Square hardware.
If you have another device, you can cross-reference it with our compatibility page to check if it's one of the Android devices that we can guarantee will work.